hangover (n.)youdaoicibaDictYouDict[hangover 词源字典]
also hang-over, 1894, "a survival, a thing left over from before," from hang (v.) + over. Meaning "after-effect of excessive drinking" is attested by 1902, American English, on notion of something left over from the night before.[hangover etymology, hangover origin, 英语词源]